I've got a 2000 XLT with the 4.0 OHV. Mine is 2wd, which helps, but with an auto trans, which does not. My lifetime mileage on the truck is ~19 mpg. My last tank netted me 22.3 mpg. Thats on a 65/35 mix of hwy/cty and a lot of A/C use. To date I have removed the roof rack, both exterior mirrors (have a small blind spot mirror inside drivers side), FM antenna (have Sirius radio), windshield wipers (using Rain-X, but I leave them in the car in case of emergency), and a partial grill block. Doing some shifting into neutral and slow acceleration, but I can't do much without a manual trans.
Looking for some underbody airflow work next.
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